Calculating dependencies... done!
[ebuild     UD] kde-base/kdelibs-3.5.5-r10 [3.5.6-r2] 
[ebuild   R   ] sys-devel/gcc-4.1.1-r1  
[ebuild   R   ] dev-util/libconf-0.42.10-r1  
[ebuild   R   ] kde-base/kolf-3.5.5  
[ebuild   R   ] kde-base/kpf-3.5.5  
[ebuild   R   ] kde-base/libkdegames-3.5.5  
[ebuild   R   ] kde-base/kdnssd-3.5.5  
[ebuild   R   ] kde-base/krfb-3.5.5  
[ebuild   R   ] kde-base/kcontrol-3.5.5  
Now you can remove -p (or --pretend) from arguments and re-run revdep-rebuild.
geekowned ~ # emerge kde-meta
Calculating dependencies /!!! A file listed in the Manifest could not be found: /usr/portage/local/layman/sabayon/kde-base/kdesktop/kdesktop-3.5.5-r1.ebuild
... done!

!!! Error: the <=app-crypt/gnupg-2.0.1 package conflicts with another package;
!!!        the two packages cannot be installed on the same system together.
!!!        Please use 'emerge --pretend' to determine blockers.

For more information about Blocked Packages, please refer to the following
section of the Gentoo Linux x86 Handbook (architecture is irrelevant):

http://www.gentoo.org/doc/en/handbook/handbook-x86.xml?full=1#blocked